So far the responses have been right on - it doesn't matter how you wire it - either from the light or the switch - as long as it works and is properly wired. I have only had small bathrooms to deal with so I usually only look at the sone rating, but if you do have a large bathroom, get a fan with greater CFM. They also have exhaust fans with lights (something I don't care for) and Heat Lamps (which may be useful in cold climates, but I don't get them).
The only problem I would otherwise see is how to exhaust the air. I've seen it vented to the attic which is a big no-no as the humidity will cause both mold and rot. You said it was a downstairs bathroom so I assume you have at least a second floor. If you do not have a way of crawling above the bathroom, you will probably have to remove sheetrock in order to exhaust to the outside wall. You should also insulate the duct if it's ever exposed to the outside air or run in an uninsulated part of the house (like a garage) since condensation will form in the duct causing more problems.
To: DoIt_Yourself@yahoogroups.com
From: jlmoss@comcast.net
Date: Fri, 10 Feb 2012 22:51:40 +0000
Subject: [DIY] Bathroom Exhaust Fan
The only problem I would otherwise see is how to exhaust the air. I've seen it vented to the attic which is a big no-no as the humidity will cause both mold and rot. You said it was a downstairs bathroom so I assume you have at least a second floor. If you do not have a way of crawling above the bathroom, you will probably have to remove sheetrock in order to exhaust to the outside wall. You should also insulate the duct if it's ever exposed to the outside air or run in an uninsulated part of the house (like a garage) since condensation will form in the duct causing more problems.
To: DoIt_Yourself@yahoogroups.com
From: jlmoss@comcast.net
Date: Fri, 10 Feb 2012 22:51:40 +0000
Subject: [DIY] Bathroom Exhaust Fan
I want to install an exhaust fan in a downstairs bathroom and have it connected to the light switch. The switch turns on a set of flourescent lights.
Do wire the fan after the the lights or before or does it matter?
Thanks for any guidance,
John
Do wire the fan after the the lights or before or does it matter?
Thanks for any guidance,
John
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